Motor-cultivator.



B. GAST.

MOTOR CULTIVATOR.

APPLICATION FILED JULY16, 1912.

Patented J an. 28, 1913.

Wzessew 30 the ground.

UNTRD SItfiiffei BRUNO GST, OF BAUMSGHULENWEG, BERLIN. GERMANY.

MOTOR-CULTIVATOR.

Specification of Letters Patent.

Patented Jan. 28, i913.

Application filed July 16, 1912. Serial No. 709,629.

v tor-plows having a plowshares holding frame suspended from the vehicle frame and capable of being raised and lowered parallel to the ground.

By the improvements the motor-eultivator on encountering during the drive some considerable obstacle hidden in the ground is enabled to automatically `withdraw its implements from under the obstacle rearward out of the ground and to stop. Yhen the considerable obstacle is visible`r the operator is by the improvements enabled to withdraw at will and in time the implements from the ground and to stop the motor-cult-ivator. Thereby all dangers of the implements being broken or damaged by the obstacle and every breakdown of the motor or motor-culL tivator are avoided, while the motor may be permitted to continue running and the driving wheels of the vehicle need not root up The implementsholding frame is according to my invention near its front end pivotally connected with the lower arms of twoarmed levers fastened on an operating shaft which is mounted in the vehicle frame to rock, while' the rear end of the implements holding frame is connected with the upper arms of the said levers by means of drawing-means passing over guiding pulleys'on 40 the vehicle frame. In this manner thel 11nplements holding frame can be moved in avertical are upward rearwardly and downward forwardly and parallel to the ground.

A worm wheel is keyed upon the operating" shaft and meshes with a worm on a worm shaft, which latter is mounted in 'the vehicle frame to turn and to longitudinally i move. The weight of the implements holding frame tends to press theworm shaft against a ball-bearing onthevehicle frame.

Any obstacle in the' which "1n ay strike one or several." of the implements, tends to push the implements holding frame to the rear and by means `of the two-armed levers and the :worm gearing also the worm shaft to ,theme/ais A vspring is provided for counteracting the thrust producent by the obstacle and means connected with the worm shaft` are provided for throwing either the n'loto-r or the mechanism for drivingr the running wheels ot the 'vehicle out of gear.

I will now proceed to describe my invention with reference to the accompanying drawing, in which--h Figure l is a vertical longitudinal section through a part. of. an improved motor-cultivator and shows a plowshares holding trame, only so much being shown as is necessary for the umlcrstanffling of the inven tion, Fig. 2 is a horizontal section through the line A --A in Fig. l. Fig. 3` is a plan view of the motor plow, certain parts being omitted for the, sake of clearness, and Fig. 4 is a detail view partlyv in section of the worm gear and :'xssoeiated parts.

Similar letters ot' reference refer to lar parts in both views.

The vehicle-frame' may comprise two par allel longitudinal beams 1/ (of which only rear parts are shown in Fig. l), two par allel rear extensions jl/l, two parallel supports y2 and two pairs of braces y and 1/4 for' carrying the rear ends of the rear extensions 1/1. Between the two beams 1/ two brackets n and nl are secured, the lower ends of which form two bearings for a worm shaft .z` that can turn and longitudinally move in them. The worm shaft 71y may be made in one with a long worm (l which meshes with a worm wheel c fastened on an operating shaft` 7n that mounted to rock in two parallel shields (not shown) connected i-n any known manner with the two beams 1/ and the two brackets n and nl. On'

nected with a plowsliares holding frame w near its front-end, while the upper .arms of the levers (L are at their free lends connected by means of two drawing means such as chains or ropes, passing over guiding ,pui` leys f/at the free ends of the extensions y with ythe rear end of the frame I do not further describe the construction of the vehicleframe nor that of the plowshares holding frame, as they are immaterial to my invention. Theshares g are adapted to out ntothe ground from the upper surface represented by the dotted line u down to a depth indicated bv the line a which is parallel to u. It will be understood,rthat when the worm wheel c is turned in the direction of the arrow 'w in Fig. 1, the plowshares produced by the weight of the plowshares holding frame a@ preferably a ball-bearing p1 is inserted between the bracket n anda collar f which is fixedly secured on the worm shaft l/i the ball-bearing being fixed to bracket n. The bracket n has a cylindrical projection a2 concentric with the shaft Zt and on this projection a cylindrical casing mi is guided.

A. helical spring Z contained in this casing surrounds the worm shaft z, and is made to bear on the one hand against the projection n2 and on .the other hand against a loose collar z' secured on the shaft It by means of a shoulder and a nut 7c. The casing 'm has an inner `annular projection m1, which is normally in contact with the loose collar z'. The casing m is closed' with a disk 0 fastened to the casing m about a shaft h1 in the laxis of the worm shaft h. Shaft h1 is preferably rigidly secured to lz.. The disk- 0 has an annular groove g1, in which two opposite pins Q2 at' the lower free ends of two levers or a forked lever g engage. The two levers or the forked lever gis mounted to rock m the vehicle frame at r and are or is pivot/ally connected with a rod t, which is in any known manner connected with a lcontrolling valve of themotor or with some movable part of a mechanism for driving the running wheels of the vehicle, so that, when the rod t is moved by the levers or le'- ver g to the left in Fig.A l, either the motor 'or the motor-cultivator is to be thereby stopped. The shaft h1 is in any knownmanner adapted to be turn'ed at will in one or the other direction either by hand or from the motor for turning the worm wheel c in the respective direction by means of the parts b and d..

Zhen during the drive of the motor-cultivator any plowsha're g should strike some hidden obstacle, for example a large stone s in the ground, it will be thereby stopped, while the motor continues running, that is the motor-cultivator continues its forward mot-ion. In consequence of thisthe stone s will push the plowshares holdingl frame a: to the rear, so that by means of the two levers L and the drawing means c the worm wheel c will be turned in the direction of the arrow et', which means, that the worm wheel c will push the worm Z with the worm shaft 7l, to the rear, whereby the strained helical spring Z will be compressed. lThen by means of the loose collar z' in contact with the ,inner projection-m1 the casingm will be shifted to the left and consequently by meansl'of the parts 0,- g2, g the rod t will be also shifted to the left, whereby the motor or the mo'- tor-cultivator will vbe stopped. It is evident, that when theA stone s strikes any plowshare, the plowshares holding frame will be moved in'an arc upward rearwardly, so that the respective plowshare may disengage from the stone. the plowshares holding frame-and the vehicle-frame are protected from ruptures and also the motor or the gears driving the running wheels areV prevented from breaking under the action of any 4sudden stoppage. The ball-bearing p1 should be so constructed in any known manner, as to prevent the balls from droppingl ofi', in ease the ballbearing is moved off' from the bracket a. The helical-spring Z can be adjusted so that it. does not act to throwthe plowshare holding frame at every thrust which is produced -by the encountering of some obstacle by one of the plows, but will yield when a thrust of a predetermined-force is exerted by such encounter. It will thus be seen that itis possible for the operator to turn the worm wheel e at will in either direction for avoiding any visible obstacle during the drive of the Vmotor-cultivator. At the same time the helical spring Z will enable the motor-cuitivator to automatically stop, should it encounter some hidden obstacle.

The invention can be applied to othermotor-cultivators than motor-plows.

The mechanism. described can be varied'in many respects wit-hout departing from the spirit of my invention, 1

I claim: *.f

l'. ln a motor-cultivator, the combination witha vehicle frame, of a shaft mounted in said vehicle frame to rock, an vimplements holding` frame, lower arms on said shaft pivotally connected with the front end of said implements holding frame, upper arms on said shaft, guiding pulleys on said vehicle frame, and 'drawing means passing" over said guiding pulleys and connectin said upper arms with the rear end of sai. implements holding frame, so that Vany obstacle in thc ground can push said implements holdingframe upward rearwardly out of the ground.

In a motor-cultivator, the combination with a vehicle frame, of an operating shaft mounted in said vehicle frame to rock, an implements holding` frame, arms on said op- In this4 manner both EGO craling shaft for moving said implements" holding trame in a vertical arc parallel to the groxmd, a worm wheel on said operating shaft, a worm shaft mounted in said vehicle frame to turn and to longitudinally move, a

Worm on said Worm shaft for meshing With said Worm wheel, and u spi-ing for pressing said Worm shaft against the thrust pro- 4 duced by any obstacle in the fround, where by by turnin said worm si ft in either diioction, sai implements ho ding frame will be lowered and raised and can be pushed by any obstacle upward rearwardly out. of the ground.

3. in a mOtOnCuItiVstOr, the combination with a vshicle frame, of an operating shaft mounted in said vehicle frame to rook, an implements holding frame, arms on said op- @rating shaft for moving said implements holding frame in s vertical are parallel to the Ground, a worm wheel on said operuting s aft, a worm shaft mounted 1n sind ve hiele frame to l'urn and 'bo longitudinally move, a worin on said woz-n1 shaft for meshing with said 'worm wheeha spring for pressing said Worm shaft against the thrust pro duced by any obstacle in the ground, where;l

by by turning said Worm shaft in either direction, said implements holding frame will ho lowered und raised sind can be pushed by any obstacle upward rearwardly out,` of the gi'ound, and means connected with said Worm shaft adapted to stop the motor or the motor-cultivator.

BRUNO GAST.

Witnesses:

TNOLDEMAR HA UPT, HENRY HASPER. 

